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Binary converter
Convert a value between binary, octal, decimal, and hex. BigInt-backed, so it stays exact for numbers far beyond the usual 53-bit limit, with a full base breakdown.
Input
Decimal → Binary
ConvertedType a base-10 value to convert it.
A free binary converter that translates numbers between binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16) in any direction. Backed by BigInt arithmetic, so it stays exact for integers far beyond JavaScript's usual 53-bit safe limit. All conversions run locally in your browser.
How to use the binary converter
- Select the base of your input value (binary, octal, decimal, or hex).
- Type the number into the input field.
- All four base representations update instantly.
- Click any output to copy it.
Why BigInt matters for base conversion
JavaScript's standard floating-point numbers (IEEE 754 doubles) lose precision for integers above 2^53 — about 9 quadrillion. The binary converter uses BigInt throughout, so a 256-bit hex value converts to binary without any digits being silently corrupted. This is important when working with cryptographic keys, large file hashes, or IPv6 addresses.
Frequently asked questions
What bases does the binary converter support?
Binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16).
How do I convert decimal to binary?
Select decimal as the input base, type your number, and the binary output updates instantly in the binary field.
Why do I need a binary converter?
Programmers use it when working with bit masks, IP addresses, color codes, memory addresses, and file permissions — any domain where multiple bases coexist.
Does the converter handle large numbers accurately?
Yes. It uses BigInt, which represents integers exactly regardless of magnitude. There is no floating-point rounding.